PSF-01 or Plasma MK. 01
A heavily armored variant of the standard heavy armor unit that has a massive scorpion tail connected to a plasma gun like cannon. It has a long cap-like attachment which can be easily placed on and removed as needed. The shell absorbs and holds the internal plasma which is created to fire the weapon. The weapon itself has 2 major modes which all comes down to the if of the user. If the focusing cap is on the weapon when it is fired it becomes a small focused bolt of plasma electrically charged and shot at a target. If the cap is not on the plasma then it will come out like a cone spray or small stream for as long as the weapon is condensing and shooting the plasma. As the gas is shot the pressure drops quickly so there is a delayed time in firing the next shot. While the focusing cap is on the plasma cannon it holds and builds the pressure much faster.

PSF-02 or Plasma MK. 02
Built into the HAS unit, it has more armor protections and sensor arrays to allow it to aim better and use more helmet based communications and functions. The main gun has become a modified heavy hunting rifle which now fires plasma bolts at the enemy dealing localized super heated gas damage.